NodeJS Multistage Dockerfile

Dockerfile

FROM node:alpine as development-base
WORKDIR /usr/src/app
COPY . .
ARG DOMAIN="dev.example.com"
ENV DOMAIN=${DOMAIN}
RUN npm install


FROM node:alpine as production-base
WORKDIR /usr/src/app
COPY . .
ARG DOMAIN="example.com"
ENV DOMAIN=${DOMAIN}
RUN npm install --production


FROM keymetrics/pm2:latest-alpine as development
WORKDIR /usr/src/app/
COPY --from=development-base /usr/src/app/ .
EXPOSE 5004/tcp
ENV NPM_CONFIG_LOGLEVEL=info NODE_ENV=development
CMD [ "pm2-runtime", "start", "/usr/src/app/index.js" ]


FROM keymetrics/pm2:latest-alpine as production
WORKDIR /usr/src/app/
EXPOSE 5004/tcp
COPY --from=production-base /usr/src/app/ .
ENV NPM_CONFIG_LOGLEVEL=warn NODE_ENV=production
CMD [ "pm2-runtime", "start", "/usr/src/app/index.js" ]

index.js

const express = require("express");
const app = express();
const bodyParser = require("body-parser");

// parse requests of content-type - application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: true }));

// parse requests of content-type - application/json
app.use(bodyParser.json());

// define a simple route
app.get("/api", (req, res) => {
  res.json(["Tony", "Lisa", "Michael", "Ginger", "Food"]);
});

app.all("/healthcheck", (req, res) => {
  res.status(200).json({
    responseCode: 200,
    responseDesc: "Success",
    environment: process.env.NODE_ENV
  });
});
app.listen("5004", function() {
  console.log(`listening on port 5004`);
});

package.json

{
  "name": "samplenode",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.17.1"
  }
}

Ensure 18.09 or later version of Docker is installed

To build for development:
DOCKER_BUILDKIT=1 docker build -t app-dev:latest --target development .

To build for production:
DOCKER_BUILDKIT=1 docker build -t app:latest --target production .